# 需要導入模塊: from pip import wheel [as 別名]
# 或者: from pip.wheel import Wheel [as 別名]
def from_line(cls, name, comes_from=None, prereleases=None):
"""Creates an InstallRequirement from a name, which might be a
requirement, directory containing 'setup.py', filename, or URL.
"""
url = None
name = name.strip()
req = None
path = os.path.normpath(os.path.abspath(name))
link = None
if is_url(name):
link = Link(name)
elif os.path.isdir(path) and (os.path.sep in name or name.startswith('.')):
if not is_installable_dir(path):
raise InstallationError("Directory %r is not installable. File 'setup.py' not found." % name)
link = Link(path_to_url(name))
elif is_archive_file(path):
if not os.path.isfile(path):
logger.warn('Requirement %r looks like a filename, but the file does not exist', name)
link = Link(path_to_url(name))
# If the line has an egg= definition, but isn't editable, pull the requirement out.
# Otherwise, assume the name is the req for the non URL/path/archive case.
if link and req is None:
url = link.url_without_fragment
req = link.egg_fragment #when fragment is None, this will become an 'unnamed' requirement
# Handle relative file URLs
if link.scheme == 'file' and re.search(r'\.\./', url):
url = path_to_url(os.path.normpath(os.path.abspath(link.path)))
# fail early for invalid or unsupported wheels
if link.ext == wheel_ext:
wheel = Wheel(link.filename) # can raise InvalidWheelFilename
if not wheel.supported():
raise UnsupportedWheel("%s is not a supported wheel on this platform." % wheel.filename)
else:
req = name
return cls(req, comes_from, url=url, prereleases=prereleases)
)